Simple index is a standard Coherence index that allows you to keep deserialized vectors in memory at all times. It eliminates the need for deserialization of vectors when performing brute-force searches across the cluster, thus improving performance and reducing GC activity, but it doesn't really optimize the search itself the way HNSW and BINARY indices do.

To configure document store to use binary quantization, post a request to the `/api/kb/<storeName>/index` endpoint and specify `SIMPLE` as the value of the `type` property:

http request
 POST /api/kb/<storeName>/index

 {
    "type": "SIMPLE"
 }